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FORCOM drug classification according to influence on comorbid diseases
| Class | Drug’s effect | Influence on comorbid disease |
|---|---|---|
| A | Favourable | Drugs with pronounced positive effects |
| B | Possible | Drugs may have a mild positive effects |
| C | Neutral | Drugs without any significant effect or contradictory effect on comorbid disease |
| D | Undesirable | Drugs with possible rare non-severe adverse effects or unexplored drugs |
| X | Unfavourable | Drugs with high incidence (≥ 1%) of severe adverse effects |
